Inteeest compttteb- x



0. KREMS.

f INTEREST COMPU-TER.

AFPucATloN FILED SEPT. 14. 1920.

1,426,484, Patented Aug. 22, 1922 2 SHEETS-SHEET 2.

v Bays 51u46 e073 9o Campari/:lewis Fig.5.

3 2l* Fig.,6.

y y A [12125121371t b Enemy UNITED sTArEs PATENT oEFilcE.

oTTo Kan-Ms, or rNNsBaUoK, Triton.

AUSTRIA.

INTEREST COMPUTER.

Original application led October Specification of Letters Patent.

Fatented A1ig.22, 19.22.

31, 1919Seria1 No; 334,905. Divided and thislapplication filed. Septomber 14, 1920. `Serial No. 410,274.

`(GRANTED UNDER THE raovIsIoNs or THE ACT or MARCH s, i921, 41 STAT. L.,j1313`.)

To all whom t may concern.'

Be it known that I, OTTO Inniis, a citizen of Austria, residing at Innsbruck, Tirol, Austria, have invented certain new and useful Improvements in Interest Computers (for which I have filed applications in Austria, October 18, 1918; in Germany, October 28, 1918; in Sweden, December 18, 1919; in Denmark, December 31, 1919; in Norway, January 7, 1920; in Holland, February 17, 1920; in Poland, February 18, 1920; and in Italy, `June `30, 1920); and I do hereby declare the following to be a full, clear, and enact description of the invention, such `as will enable others skilled in the art to which it appertains to make and use the same.

This invent-ionA relates to that class of interest computers in .which the total amount of interest for a given rate of interest, a given period of time and a given capital is found by summing up a series of numbers l `representing the interests for the saine rate of interest and the same period of time of the summands represented by the various places of the number indicating the total capital sum. 1

rlhe chief object of my invention is to avoid errors. This application is a division of SerialNo. 334,905. p V

In the accompanyingdrawings Fig'. 1 is aV front elevation as `viewed in the direction of arrow A, Fig'. 2 is a section' on line B, O, Fig. 1, of part of my improved interest computer. Figs. 8 and 4 are a plan view and a front elevation of one constructional form ofthe entire interest computer and Figs. 5, 6 are similar views of another constructional form thereof. Fig. 7 is a top plan view showing two adjacent compartments in con nection with a slide and the denomination sections, and F 8 is a fragmentary side view thereof.

Referring more particularly to Figs. 1 `and 2, 1 is a guideblock, the front face of which is preferably in a vertical plane. The guide block is provided with a plurality of shelves dividing it into a number of guides-in the example shown Figs. 1 and 2 into four guides and a fifth fragmentary guideequal to the number of places of the highest sum of capital for which the apparatus is designed (in the example shown 99999) .d 101 is application filed October' 31st 1919,`

a cover plate covering the front side of the guides, '7 are longitudinal slots in a cover plate provided near one end with enlargements or openings 4. 15 is a compartmenty sands, hundreds, Ftens, and units7 to correspond to the place value of the slides normally contained in these guides are' designed. On the cover plate 101 of the guide block there are drawn nine transverse Vlines vmarked 1 9 andthe slides are marked with figures giving the interests for a given period of time and a given rate ofinterest of capital the amount of which is consecutively equal 1, 2, 9 times the place value for Vwhich theslide is used the arrangement being such that when any slide, say the thousands slide is pushed from its guidein the compartment 1,5 into the `corresponding guide in the guide block 3, (the latter guide being exactly opposite and in time with the former guide in the compartment 15) until the knob 6 of such slide `(the thousands slide) is brought onto any yof the `transverse lines 1 to 9 on the cover plate 101 of the guideblock 11 (say onto the line 5),

theftigure (79,687 as shown) of this `slide then exhibited through the opening 4 of the corresponding guide in the guide block gives the interest of a sum of capital, the value of which is as many times (5 times) the place value (thousands) for which lthe slide is used, as indicated by the number of the transverse line, so that the figure 7 9,687 shown in Fig. 1 is the interest of Va sum of $155000 for the given time and rate ofinterest.

Assuming that the interest of a sum of $45,000` at for J1- months (135 days) has to be computed then slides are made use of which show figures corresponding to 4}% and 135 days. The ten thousands slide is i rpushed into its guide inthe block 1 `and along the same runtil its knob`6 is on the transverse` line 4i, the knob of thethousands vslide is adjusted in the same way in its guide D in theguide block to the transverse line 5 While the hundreds7 the tens and the unir slides are lett at rest in their respecti ve in the compartment l5 as shown and 2 and the figures (523?,500 an "i speetively ol the consecutive slides i peering` in iront oit` the Corresp-ndi f ings are summed up givinl $7 interest for days et the eapial of i fu).

The slides are preferably kept in their adjusted position by suitable catches such as balls ll acted upon by springs l0 locatedin the block l and engaging into recesses on the back of the slides.

In order to adapt the interest computer for `different rates of interest and diili'erent periods elf time i arrange according` to my pirsent invention shown in Figs. 3 and la. plurality of guide blocks l constructeil as above described the one above the other in a vertical slide frame 2l adapted to move along one side oit a bor; 22 on a base plate 223, this slide trame being guided by sleeves fastened to the same and eiigagine puide rods 24 fastened to the box 22.

The be); 22 is subdivided into compartments l5 arranged in vertical and horizontal series each of such compartments being constructed and containing .slides 3 as above described. The slides in the compartments of a vertical series are im arlted with figures corresponding' t-o diiii'erent rates oit interest but to the same period olf time thrmighout. thus 'for instance the slides in the .lirst veical .series of compartments in the boit 22 showY in the order from top to bottom the interest, oit ten thousands, thousands, hundreds. tens and units, then the 41% interest tor ten thousands, thousands. hundreds. tens and units and so on all for .l day. The next following vertical series oi efm'ugiartments contains slides marked vwith tirgurcs eorrespondiner to the same rates ot interest (fmll-f/V@ and so on) but tor 2 d ays tlnoupglu out, the slides in the third ical of compartments are marked Wib tile'ures corresponding to the said rates et interest but tor 3 days and so on. The slides in a bori- Zontal series ot compartments ot the box 22 are marked with figures corresponding; to the same rate oitl interest throuejhout7 b l to different periods of time; thus for instance Yfor the uppermost horizontal series et compartments the 5% interest throughout the series for l, 27 3, etc., days.

The guides in the compartments of the box 22 are open at the side of the box along` which the slide frame 2l is adapted to more.

Preferably the number of superposed blocks l in the slide frame is equal to the number of compartments l5 in a vertical series in the box 22, the arrangement being such that when the slide frame 2l is brought in front of any of the vertical series of compartments in the box 22 each of the `guides in the guide blocks in the slide traine is ieee-,eee

E de in the tinents.

erest ot a sum to he computed opposite to and iu line with :i said vertical series ol1 compa rrssuininp' non' the in et' ilo() ifor 135 dais` has then the slide frame 2l series in the nox 22 are pushed by means ot their luobs into the guides in the corresponding' block l in the slide traine also marked 41% and adjusted therein as hereinbeliore defiscribcd. By SuuniniVn up the figures then appearing in 't'r` ie openings l of this blocl the sum .729.76 is obtained which is the interest sought.

Besides the scale giving` the periods of time another scale 26 may be provided, which gives dates in such a manner' that the numbers on the 2T give the days (or other periods ot times, such as tortnights) counted trom thc eorresponfflino' date ein the scale 26 up to a predetermined hXf-d date. 'for instance 'trom the iirst named running; date to the end ot a s .inester or year. simply adjusting the slide trame 2l on the scale 2G to the running date it will also be adted the coiresi'iondinu period oil! time sicated on the scale whereby the necessity et determining' the period et time from dai s and errors consequent thereupon are arouled. Suitable catches may be provided on the slide block 2l tor temporarily holdme it in any adjusted position.

lu order to malte the knobs G ot the slides in tee bei; 22 readily accessible and to 'facilitate the linflincout and ha'udline` ot any individual slide the box' 22 has 'torlits base au oblique parallelopgi'am as shown in Fig. 5l. the lides 9) contained therein and the slide traine 2l being' parallel to one ot the sides of the boi: and Forming an oblique angle with the other sine thereot Ytrom which the slides are pushed into the tguide blocks l. TherebjY all the lz'nnbs (l are Visible at a time and may be taken hold of individually without interlerin;r with other knobs or slides as the hn eb end et any slide projects beyond the knob end of slides in preceeding vertical series oit compartments as is clearly seen trom ln this construction the depth of each compartment in the box must be made ,ei-eater than the thickness ot the slide plus the height ot' the knob in order thatithe In Figs. 5 and 6 a modification of my 3 and 4C.

-apparatus is shown whichpermitstwo pei` sons to use the same simultaneously with out at the same time unduly increasing.;` the space occupied bythe box 22.

, In this case" there are provided in the slide box 22 two systems of compartments and two independent slide tramesl, 31 one on each of two opposite sides o-:t the box. @ne of the systems of compartments belongs to and opens towards the slide trame 21 and the other towards the other slide trame 31. The vertical series of compartments ot one system alternate with those ot the other so that one vertical series of compartmentsi belongs to one system and one slide trame 21 and the next one 35 to the otherjsystem and slide frame 31. Otherwise the construction and arrangement is more particularly of the slide frames and'their blocks 1 substantially the same as in Figs. 3 and 4f.. The period of time for all the slides in a vertical series in the slide box is the same through` out.

In using the apparatus shown in Figs. i and 5 each of the slide frames 21, 31 may be adjusted independently `for any given' period of time and then the required slides may be pushed trom the corresponding compartment of the box into the same as above described; Even if both slide Jframes were as nearly opposite each other as possible and slides of compartments in the same level (as for the same rate of interest) would have to be pushed into both slide trames, the

one attendant would not interfere with the other because the slides for the two slide trames are in diii'erent compartments 15, By this arrangement not only the working capacity of the apparatus is doubled but also the manipulation is greatly facilitated because the height of.' the knobs is notably increased, all other things beingequal as com paredwith the construction shown in Figs,

The apparatus consists ot a stationary box, divided into compartments parallel to each other and to the base and one of the walls (the front wall) of the box. A plurality of such compartments is superposed vertically, each of such compartments corresponding to one rate ot'interest, say from 2% rising by increments of 1;(7@ to 6% from bottom to top, and a plurality of such compartments is arranged on the same level, the one behind the other in a direction from front to back, the various compartments in each of these horizontal series Correspendingto a given rate of interest but to different periods of time say from-15 days to six months rising by increments of 15 days from iront to baclrl Each compartment consists of a plurality of superposed guides say ve in number for units, tens, hundreds, thousands and ten thousands of the capital sum. Each of these guides contains a slide having inscribed thereon the .amount of interest Jfor a sum oif capital ot 1, 2, 9 times the place value corresponding to the particular guide of the compartment and to the rate oir' interest and period of time corresponding to the positien occupied bv the compartment under consideration in thebox, and further the f tically superposed guidebloclrs equal in number to the superposed compartments of a ver# tical series inthe box, each of such guide blocks `havinga plurality of guides at one end equal in number to the number ot guides in the compartments. The whole is so arranged that when the slide frame 21 is brought in front oit any oit the vertical series ot compartments in the box, the guides in the guide blocks of the slide tramev have their open ends opposite the open ends of the guides in the compartments of the box and in proximity theretoand the corresponding guides in the guide blocks and in the compartments are in line with each other softhat the slide of the guide in a compartment of the box may be pushed into the corresponding` guide of a guide block in the slide trame.

'ilhe.modilication shown in Fiss. 5 and 6 consists merely in duplicatingthe vertical series oi compartments in the box, one of such vertical series having their open ends at one andthe other at the other side of the bom an d each cooperating in exactly the man-- ner above set forth with a separate slide tra me provided on the Correspendinga side of the box. Thereby the distance between the slide f actuating knobs of consecutive vertical series of compartmentsv cooperating with one slide trame is doubled and the apparatus is more convenient for handling permitting at the same time the use ot the apparatus by two attendants independently the one from the other. The scales 26 and 27 are structurally identical, only theirnumbering` is different; the one serves 'tor computing postnumerando i and the other for computing anticipando interest.

. Themechanical details ot construction of the apparatus may be varied within wide limits, without departing. from the essencev of my invention.

I claim: y

Inan interest computer the combination of a box havingr a base in the shape of an oblique parallelogram and subdivided into compartments arranged in vertical and horizontal seriespguidesiin such compartments parallel to the baseand one side of the box,` such guides being open at one of the other sides of the boxJ slides adapted to move in such guides, a slide frame, vertical guide blocks equal in number to the compartments n a vertical eerie-"5 in the box in such .slide frame and guides in such guide blocks such guides being open et the end i ext to the side of the boi; Where 'the guides in the lutter are open and their number iu each guide block being equal to the number of guides in ezteh compartment and the guides in the guide blool being adapted 'to receive :md guide the Said slides, means Yfor moving the slide frame along that side ol' the box where the guides in the compartments open wherebv e guide block can be brought in front or' my compartment of horizontal series in the box7 the guides in the compartment und in Vthe guide block being in line with und opposite each other and means lor pushing the slides in the compartments in the guides from the guides in the guide blocks and for adjusting them in the letter substantially as :incl for the purpose described.

OTTO KREMS. 

